1 files changed, 211 insertions, 0 deletions
diff --git a/jsf/plugins/org.eclipse.jst.pagedesigner/src/org/eclipse/jst/pagedesigner/utils/JSPUtil.java b/jsf/plugins/org.eclipse.jst.pagedesigner/src/org/eclipse/jst/pagedesigner/utils/JSPUtil.java
new file mode 100644
index 000000000..57c4caa92
--- /dev/null
+++ b/jsf/plugins/org.eclipse.jst.pagedesigner/src/org/eclipse/jst/pagedesigner/utils/JSPUtil.java
@@ -0,0 +1,211 @@
+/*******************************************************************************
+ * Copyright (c) 2006 Sybase, Inc. and others.
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Sybase, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jst.pagedesigner.utils;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.runtime.IPath;
+import org.eclipse.jst.jsp.core.internal.contentmodel.TaglibController;
+import org.eclipse.jst.jsp.core.internal.contentmodel.tld.TLDCMDocumentManager;
+import org.eclipse.jst.jsp.core.internal.contentmodel.tld.TaglibTracker;
+import org.eclipse.jst.jsp.core.internal.contentmodel.tld.provisional.TLDDocument;
+import org.eclipse.jst.jsp.core.taglib.TaglibIndex;
+import org.eclipse.jst.pagedesigner.IJMTConstants;
+import org.eclipse.jst.pagedesigner.css2.property.ICSSPropertyID;
+import org.eclipse.wst.html.core.internal.format.HTMLFormatProcessorImpl;
+import org.eclipse.wst.xml.core.internal.contentmodel.CMDocument;
+import org.eclipse.wst.xml.core.internal.provisional.document.IDOMElement;
+import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+
+/**
+ * utility class for JSP related information.
+ * 
+ * @author mengbo
+ */
+public class JSPUtil {
+	/**
+	 * find out whether the specified taglib has been defined in the IDOMModel.
+	 * If found, then return the prefix. If can't find, then will try to add a
+	 * taglib declaration into the model, and try to use the specified default
+	 * prefix
+	 * 
+	 * @param model
+	 * @param uri
+	 * @return
+	 */
+	public static String getOrCreatePrefix(IDOMModel model, String uri,
+			String defaultPrefix) {
+		return getOrCreatePrefix(model, uri, defaultPrefix, null);
+	}
+
+	/**
+	 * 
+	 * @param model
+	 * @param uri
+	 * @param defaultPrefix
+	 * @param nodes
+	 *            if a taglib node is created, then the created tag lib node is
+	 *            returned in this.
+	 * @return
+	 */
+	public static String getOrCreatePrefix(IDOMModel model, String uri,
+			String defaultPrefix, Node[] nodes) {
+		String prefix = getPrefix(model, uri);
+		if (prefix != null) {
+			return prefix;
+		}
+		String s = findUnusedPrefix(model, defaultPrefix);
+
+		// TODO: should create the taglib inside the IDOMModel
+		Node[] ref = new Node[1];
+		BodyHelper.findHeaderInsertPosition(IJMTConstants.URI_JSP, "taglib",
+				model.getDocument(), ref);
+		Element ele = model.getDocument().createElement("jsp:directive.taglib");
+		((IDOMElement) ele).setJSPTag(true);
+		ele.setAttribute(ICSSPropertyID.ATTR_URI, uri);
+		ele.setAttribute(ICSSPropertyID.ATTR_PREFIX, s);
+		if (nodes != null && nodes.length > 0) {
+			nodes[0] = ele;
+		}
+		model.getDocument().insertBefore(ele, ref[0]);
+		new HTMLFormatProcessorImpl().formatNode(ele);
+		return s;
+	}
+
+	/**
+	 * 
+	 * @param model
+	 * @param uri
+	 * @return null means this is tld is not declared in the jsp file
+	 */
+	public static String getPrefix(IDOMModel model, String uri) {
+		TLDCMDocumentManager m = TaglibController.getTLDCMDocumentManager(model
+				.getStructuredDocument());
+		if (m == null) {
+			return null;
+		}
+		List trackers = m.getTaglibTrackers();
+		for (Iterator iter = trackers.iterator(); iter.hasNext();) {
+			TaglibTracker tracker = (TaglibTracker) iter.next();
+			if (uri.equals(tracker.getURI())) {
+				return tracker.getPrefix();
+			} else {
+				CMDocument cmdoc = tracker.getDocument();
+				if (cmdoc instanceof TLDDocument
+						&& uri.equals(((TLDDocument) cmdoc).getUri())) {
+					return tracker.getPrefix();
+				}
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * create specified taglib declaration
+	 * 
+	 * @param model
+	 * @param uri
+	 * @param prefix
+	 * @return
+	 */
+	public static Element createTaglibDeclaration(IDOMModel model, String uri,
+			String prefix) {
+		Node[] ref = new Node[1];
+		BodyHelper.findHeaderInsertPosition(IJMTConstants.URI_JSP, "taglib",
+				model.getDocument(), ref);
+		Element ele = model.getDocument().createElement("jsp:directive.taglib");
+		((IDOMElement) ele).setJSPTag(true);
+		ele.setAttribute("uri", uri);
+		ele.setAttribute("prefix", prefix);
+		model.getDocument().insertBefore(ele, ref[0]);
+		return ele;
+	}
+
+	public static String findUnusedPrefix(IDOMModel model, String suggestion) {
+		if (suggestion == null) {
+			suggestion = "p";
+		}
+		TLDCMDocumentManager m = TaglibController.getTLDCMDocumentManager(model
+				.getStructuredDocument());
+		if (m == null) {
+			return suggestion;
+		}
+		List trackers = m.getTaglibTrackers();
+		Set map = new HashSet();
+		for (Iterator iter = trackers.iterator(); iter.hasNext();) {
+			TaglibTracker tracker = (TaglibTracker) iter.next();
+			map.add(tracker.getPrefix());
+		}
+		if (!map.contains(suggestion)) {
+			return suggestion;
+		}
+		for (int i = 1;; i++) {
+			if (!map.contains(suggestion + i)) {
+				return suggestion + i;
+			}
+		}
+	}
+
+	/**
+	 * given the prefix, find the corresponding jsp tld URI.
+	 * 
+	 * @param model
+	 * @param prefix
+	 * @return
+	 */
+	public static String findURIForPrefix(IDOMModel model, String prefix) {
+		if (prefix == null || model == null) {
+			return null;
+		}
+		TLDCMDocumentManager m = TaglibController.getTLDCMDocumentManager(model
+				.getStructuredDocument());
+		if (m == null) {
+			return null;
+		}
+		List trackers = m.getTaglibTrackers();
+		for (Iterator iter = trackers.iterator(); iter.hasNext();) {
+			TaglibTracker tracker = (TaglibTracker) iter.next();
+			if (prefix.equals(tracker.getPrefix())) {
+				CMDocument cmdoc = tracker.getDocument();
+				if (cmdoc instanceof TLDDocument) {
+					return ((TLDDocument) cmdoc).getUri();
+				} else {
+					return null;
+				}
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * judge whether the the baseFile belonged project can support uri specified
+	 * tag lib
+	 * 
+	 * @param uri
+	 *            tag lib uri
+	 * @param baseFile
+	 * @return
+	 */
+	public static boolean supportTaglib(String uri, IFile baseFile) {
+		IPath location = baseFile.getLocation();
+		if (location != null) {
+			return TaglibIndex.resolve(location.toString(), uri, false) != null;
+		}
+		return false;
+	}
+}